Stigmastadiene and specific extitntion (270 nm) to evaluate the presence of refined oils in virgin olive oil commercialized in Brazil

Food Science and Technology (Campinas)

Sabria Aued-pimentel¹  Simone Alves Da Silva¹  Emy Takemoto¹  Cristiane Bonaldi Cano¹ 

[1] ,Instituto Adolfo Lutz Núcleo de Química, Física e Sensorial, Centro de Alimentos São Paulo SP ,Brasil

关键词: adulteration;    quality control;    legislation;   

DOI  :  10.1590/S0101-20612013005000067

来源: SciELO

【 摘 要 】

The increased marketing of olive oil in Brazil has intensified legal requirements to ensure regulation of this product. The measurement of the specific extinction at 270 nm (E 270) and content of stigmastadiene can be used to assess the presence of refined oils in virgin olive oil. During the vegetable oil refining process, compounds with conjugated double bonds are generated from unsaturated fatty acids that absorb at 270 nm and sterols, such as stigmasta-3,5-diene. To compare these parameters, seven samples of extra virgin olive oil and three samples of olive oil (blend of virgin and refined) were analyzed. Among the samples analyzed, four extra virgin samples had levels of stigmastadiene and E 270 higher than expected, among which two were adulterated with seed oil (rich in linoleic acid) and the other two with olive pomace oil. The results demonstrate the higher sensitivity of stigmastadiene to determine the presence of the refined oil in virgin olive oil and good agreement with determining E 270. The latter technique is a simple, quick, and low cost method of determination that can be easily implemented in laboratories to assist in the screening and regulation of olive oils sold in Brazil.

【 授权许可】

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